Automatic alarm



June 26, 1923.

. 1 ,460,019 F. P. HARTLEY AUTOMATIC ALARM Filed Oct. 25. 1922 2Sheets-Sheet 1 j 2 I avwemtoz fimflf ZJarZZ y June 26, 1923. 1,460,019

F. P. HARTLEY AUTOMATI C ALARM Filed 001. 25. 1922 2 Sheets-Sheet 2 Wanefi ZZTZ Patented June 25, 19nd.

entree stares insane earner @FHQEE.

FRANK PERLEY HARTLEY, 0F BANGOR, .MAINE.

AUTOIKATIC ALARJVI.

Application filed October as, 1922. Serial n). 596,365.

in the art to which it appertains to make and use the same. 1

Mylnvention relates to improvements in automatic alarms and'moreparticularly to those operated by a thermostat, tor the purpose ofsounding an alarm in case of fire.

The object of the invention is to provide an extremely simple andeffective, yet a highly eflicient and reliable device for obtaining thenecessary results...

With the foregoing in view, the invention resides in the novel subjectmatter hereinafter described and claimed, the description beingsupplemented by the accompanying drawings y p v Figure 1 is a top viewpartly in horizontal section. V

Fig. 2 is a bottom plan.

Fig. 3 is avertical section on line 3 Fig. 1.

Fig. 4 is a side elevation door opened.

Fig. 5 is a horizontal section on line 5-5 of Fig. 1.

In the construction here disclosed, the numeral 1 designates a casinghaving an opening 2 occupying the greater part of the area of itsbottom, said openinghowever, being substantially closed by a disk-likethermostat 3. The entire casing is preferably constructed of metal orother tire-proof material and the thermostatically controlled means forsounding an alarm incase of fire, are located for the most part withinsaid casing, a suitable door 1 being provided so that access to theinternal parts may be had whenever desired.

In the present showing, I have illustrated a spring motor 5 withinthecasing for operating a bell clapper 5 which extends through the. casingtop for coa'ction with a bell 6. Operation of this clapper however isnormally prevented by an alarm control 1 lever 7 which is fulcrumed at 8upon a post with the casing casing, as indicated at 11 then extendshorizontally in one direction as indicated at 12, a f

is next directed horizontally at right angles as shown at 13, andterminates in a free end 14 parallel with the portion 12. This leverterminal 14 normally is heldby a nose 15 on avertically movable latchlever 16 which is fulcrumed between its ends 17 on a. sup porting arm 18which depends from the casing top. This arm is provided with a finger 19which normally engages the lever end 1-11 to prevent the latter fromaccidentally springingaway from the nose 15. Assoon as this nosereleases the lever 7, the latter is moved by a coiled spring 20, so thatit in turn releases the bell clapper 5, permitting the latter to comeinto operation.

At this point, it may bestated that in Y stead of using the spring motoron the parts 5. and 6, Imight rely upon the lever 7 striking a' contact(not shown) to complete an electrical circuit for the purpose ofsounding an alarm.

The end of the latch lever 16, remote from its nose 15, is provided witha tubular guide 21 which is pivoted thereto by means of a set screw 23which extends to the interior of said guide for the purpose of clampinga latch releasing needle 24 in adjusted position in said guide. Thisneedle engages a seat at the center of the thermostat 3 and it will thusbe seen that after proper adjustment of said needle, expansion of thethermostat under heat, will cause the lever 16 to release the controllever 7,thereby effecting sounding of the alarm.

As excellent results have been obtained from the details disclosed, theyare preferably followed, but within the scope of the invention asclaimed, numerous changes maybe made.

I claim 1. An automatic alarm comprising a sup.

port, a thermostat carried thereby, alarm means, an alarm controlelement carried by said support and preventing operation of the alarmwhen in a setposition, means yieldably holding said control againstmovement to a set position, a latch movably carried by said support forengaging said alarm control and releasably holding the minor alarmcontrol in a setposition, and means connecting said latch with saidthermostat for permitting operation of said latch by said thermostat. I

2. An automatic alarm comprising a casa thermostat.

ing having casing, and yieldably held against movement into setposition, said lever When in a set position preventing operation of thealarm means, a latch pivoted on said bracket for normally holding saidlever against movement out of a setposition, a thermostat at one side ofthe casing, and a releasing device pivoted to said. latch andengagingsaid Y ,Y 3. =An automatic alarm comprising a support carrying athermostat, alarm means, an alarm control pivotedon said support, andyieldably held against movement to a set position, the alarm controlwhen in a set position preventing operation of the alarm,.a latch leverifulcrumed-on said support and having a nose normally engaging saidcontrol to hold the control in a set position, a guide pivoted to saidlatch lever, and a releasing needle-adjustably held in said guide andengaging said thermostat.

4. An automatic alarm comprising a casing having an opening in itsbottom and athermostat substantially closing saidopening, a bell mountedon the upper side of said casing, a bellclapperaextending through thecasing top and a spring motor in the casing to operate said clapper, alever fulcrumed on the casing and When in an operative posi tionengaging said clapper to hold the same against operation, spring meansengaging said lever for moving the lever out ot'an operative position,said lever extending downwardly through an opening in the casing top andhaving a horizontally directed inner end, a bracket arm within thecasing extending from one side thereof, a vertically swinging latchlever fulcrumed on said bracket arm and normally engaging said firstnamed lever to hold the latter against a movement by said spring and areleasing device extending from'the other end of said latch lever tosaid thermostat. I

In testimony whereof I have hereunto aflixed my signature.

FRANK PERLEY HARTLEY:

